We use the antisymmetric Fock space ( "fermions"). We denote by [tex]c(h)[/tex] a creator operator.(adsbygoogle = window.adsbygoogle || []).push({});

I need to evaluate the following quantity:

[tex]< \Omega , \big(c(h_1)+c(h_1)^{*}\big)\big(c(h_2)+c(h_2)^{*}\big) \ldots \big(c(h_n)+c(h_n)^*\big)\Omega>[/tex]

where [tex]\Omega[/tex] is the unit vector called vaccum, [tex] <\cdot\ ,\ \cdot>[/tex] the scalar product and [tex]h_1,\ldots,h_n[/tex] any vectors.

I need a reference or an explanation.

Thank you!

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# Wick product

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